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Solar-driven seawater lithium extraction system and preparation method thereof

A technology of solar energy and seawater, applied in the field of solar-driven lithium extraction system from seawater and its preparation, can solve the problems of high cost of solid electrolyte film, the need for sealing the system, unfavorable application, etc., and achieves feasibility, practicability, simple scientific principle, and easy popularization. Effect

Active Publication Date: 2021-08-24
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the disadvantage is that the cost of the solid electrolyte film is high, and the system needs to be sealed, which is not conducive to the practical application in the open ocean environment

Method used

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  • Solar-driven seawater lithium extraction system and preparation method thereof
  • Solar-driven seawater lithium extraction system and preparation method thereof
  • Solar-driven seawater lithium extraction system and preparation method thereof

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preparation example Construction

[0060] The embodiment of the present invention provides a preparation method of a solar-driven seawater lithium extraction system, the method comprising the following specific steps:

[0061] Step 1: Selection and preparation of cathode

[0062] A1: Selection of lithium enrichment materials

[0063] The electrode material with specificity for lithium ion selection is selected as the cathode material.

[0064] The crystal with specific storage sites for Li ion selection is: LiFePO 4 , LiMn 2 o 4 , Li 1-x mn 2 o 4 , λ-MnO 2 、Ni 1 / 3 co 1 / 3 mn 1 / 3 o 2 、Ni 0.5 mn 1.5 o 4 And after coating through structural optimization, such as LiFePO 4 @TiO 2 、LiFePO 4 @SiO 2 、LiFePO 4 @PDA et al.

[0065] A2: Preparation of cathode

[0066] The cathode is prepared by spin coating or dipping and pulling;

[0067] i) Coating: The lithium-enriched material, the conductive agent, and the binder are ground according to the ratio under the action of the solvent for 10 to 30 minut...

Embodiment 1

[0106] Spin coating + substrate growth

[0107] The cathode material selected in this embodiment is that the molecular formula is LiFePO 4 ; The photoanode material is titanium dioxide N-type semiconductor, and its molecular formula is TiO 2 ; The electrolyte is natural seawater.

[0108] Step 1: LiFePO 4 Preparation of lithium-enriched cathode materials

[0109] Equivalent amount (0.05) of FeCl 2 h 2 O, LiCO 3 and H 3 PO 4 In order to serve as Fe source, Li source, and P source, add to 200ml of absolute ethanol in sequence, after supernatant dispersion, stir at room temperature (25°C), after the sol is completely transformed into a gray gel, after standing at room temperature for 12 hours, transfer the product To 80 ℃ blast drying oven, dry for 12 hours. Then the dried product was ground into powder in an agate mortar and transferred to a porcelain boat, and calcined at 500°C for 10 hours at a heating rate of 5°C / min under the protection of a nitrogen atmosphere in a...

Embodiment 2

[0119] Spin coating + anodizing method

[0120] The cathode material selected in this embodiment is that the molecular formula is LiFePO 4 ; The photoanode material is titanium dioxide N-type semiconductor, and its molecular formula is TiO 2 ; The electrolyte is natural seawater.

[0121] Step 1: LiFePO 4 Preparation of lithium-enriched cathode materials

[0122] Equivalent amount (0.05) of FeCl 2 h 2 O, LiCO 3 and H 3 PO 4 In order to serve as Fe source, Li source, and P source, add to 200ml of absolute ethanol in sequence, after supernatant dispersion, stir at room temperature (25°C), after the sol is completely transformed into a gray gel, after standing at room temperature for 12 hours, transfer the product To 80 ℃ blast drying oven, dry for 12 hours. Then the dried product was ground into powder in an agate mortar and transferred to a porcelain boat, and calcined at 500°C for 10 hours at a heating rate of 5°C / min under the protection of a nitrogen atmosphere in a t...

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Abstract

The invention discloses a solar-driven seawater lithium extraction system and a preparation method thereof. Sunlight is used as a unique energy input source, and the system is simple in scientific principle, safe, stable, fully friendly to the environment, low in manufacturing cost, feasible in practicability and easy to popularize. An N-type semiconductor is mainly used for photoexcitation to generate photo-generated electron hole pairs during illumination, and electrons are provided for the lithium extraction process. A lithium enrichment material is mainly used for receiving the electrons and providing storage sites of lithium ions. According to the embodiment of the system, the stable and reusable seawater lithium extraction system can be obtained on the premise that simplicity and environment friendliness of a process are ensured.

Description

technical field [0001] The invention relates to the field of photoelectric conversion and energy, in particular to a solar-driven seawater lithium extraction system and a preparation method thereof. Background technique [0002] In recent years, due to the popularity of electric vehicles and portable electronic devices, the market size of lithium batteries has expanded significantly. On the premise of only considering the demand for lithium resources brought about by the growth of electric vehicles, the consumption of lithium resources in the next 30 years will account for 1 / 3 of the world's mineable lithium reserves, and it is estimated that the global lithium resources will be exhausted in 2080. Compared with lithium resources on land, the lithium reserves in seawater are 16,000 times that of land reserves. Considering this high reserve, research institutions in various countries have developed technologies for extracting lithium from seawater. However, since the lithium ...

Claims

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Application Information

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IPC IPC(8): C22B3/20C22B26/12C22B3/02
CPCC22B3/20C22B26/12C22B3/02
Inventor 党琪唐量王佳俊陈文倩施文彦吴明红
Owner SHANGHAI UNIV
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